TY  - BOOK
AU  - Heller
TI  - International trade: theory and empirical evidence 
U1  - 382 21
PY  - 1968///].
CY  - Englewood Cliffs, N.J: 
PB  - Prentice-Hall, 
KW  - Commerce
KW  - International trade
N1  - Includes bibliographical references and index
ER  -